If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Barnaul: The hottest months are usually July and June with an average temp of 64°F, while the coldest months are January and February with an average of 10°F. The snowiest months in Barnaul are March, February, January, and December, with each month seeing an average of 51 inches of snowfall.